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Explanation: Iapetus has an unusual surface, one half of which is very dark, the other half very light. This caused it's discoverer Cassini to remark that Iapetus could only be seen when on one side of Saturn but not the other. The reason for the difference between hemispheres is presently unknown. Iapetus is the third largest of Saturn's moon behind Titan and Rhea. Iapetus is composed predominantly of water ice.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Saturn
Publications with words: Saturn
See also:
- APOD: 2025 September 25 B Saturn Opposite the Sun
- APOD: 2025 September 22 B Equinox at Saturn
- APOD: 2025 February 23 B Saturn in Infrared from Cassini
- APOD: 2024 December 8 B Aurora around Saturns North Pole
- Saturn at Night
- APOD: 2024 August 27 B Moon Eclipses Saturn
- APOD: 2024 June 23 B The Colors of Saturn from Cassini